KAMEZAWA Hiroyuki
38460b48d0
cgroup: CSS ID support ...
Patch for Per-CSS(Cgroup Subsys State) ID and private hierarchy code.
This patch attaches unique ID to each css and provides following.
- css_lookup(subsys, id)
returns pointer to struct cgroup_subysys_state of id.
- css_get_next(subsys, id, rootid, depth, foundid)
returns the next css under "root" by scanning
When cgroup_subsys->use_id is set, an id for css is maintained.
The cgroup framework only parepares
- css_id of root css for subsys
- id is automatically attached at creation of css.
- id is *not* freed automatically. Because the cgroup framework
don't know lifetime of cgroup_subsys_state.
free_css_id() function is provided. This must be called by subsys.
There are several reasons to develop this.
- Saving space .... For example, memcg's swap_cgroup is array of
pointers to cgroup. But it is not necessary to be very fast.
By replacing pointers(8bytes per ent) to ID (2byes per ent), we can
reduce much amount of memory usage.
- Scanning without lock.
CSS_ID provides "scan id under this ROOT" function. By this, scanning
css under root can be written without locks.
ex)
do {
rcu_read_lock();
next = cgroup_get_next(subsys, id, root, &found);
/* check sanity of next here */
css_tryget();
rcu_read_unlock();
id = found + 1
} while(...)
Characteristics:
- Each css has unique ID under subsys.
- Lifetime of ID is controlled by subsys.
- css ID contains "ID" and "Depth in hierarchy" and stack of hierarchy
- Allowed ID is 1-65535, ID 0 is UNUSED ID.
Design Choices:
- scan-by-ID v.s. scan-by-tree-walk.
As /proc's pid scan does, scan-by-ID is robust when scanning is done
by following kind of routine.
scan -> rest a while(release a lock) -> conitunue from interrupted
memcg's hierarchical reclaim does this.
- When subsys->use_id is set, # of css in the system is limited to
65535.
[bharata@linux.vnet.ibm.com: remove rcu_read_lock() from css_get_next()]
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-02 19:04:53 -07:00
PM: Introduce functions for suspending and resuming device interrupts
2009-03-30 21:46:54 +02:00
pm: rework includes, remove arch ifdefs
2009-04-01 08:59:16 -07:00
Merge branch 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-26 16:05:42 -07:00
Merge commit 'origin/master' into next
2009-03-11 17:10:07 +11:00
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
async: remove the temporary (2.6.29) "async is off by default" code
2009-03-28 13:05:30 -07:00
[PATCH] fix broken timestamps in AVC generated by kernel threads
2008-12-09 02:27:41 -05:00
fixing audit rule ordering mess, part 1
2009-01-04 15:14:41 -05:00
audit: validate comparison operations, store them in sane form
2009-01-04 15:14:42 -05:00
audit: validate comparison operations, store them in sane form
2009-01-04 15:14:42 -05:00
make sure that filterkey of task,always rules is reported
2009-01-04 15:14:42 -05:00
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
cgroup: CSS ID support
2009-04-02 19:04:53 -07:00
cgroups: fix probable race with put_css_set[_taskexit] and find_css_set
2008-10-20 08:52:38 -07:00
freezer_cg: disable writing freezer.state of root cgroup
2008-11-12 17:17:16 -08:00
Allow times and time system calls to return small negative values
2009-01-06 15:59:13 -08:00
kernel/configs.c: remove useless comments
2008-10-20 08:52:34 -07:00
cpumask: use set_cpu_active in init/main.c
2009-03-30 22:05:12 +10:30
cpuset: fix possible deadlock in async_rebuild_sched_domains
2009-01-19 02:44:00 +01:00
CRED: Inaugurate COW credentials
2008-11-14 10:39:23 +11:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6
2009-01-09 13:59:25 -08:00
schedstat: consolidate per-task cpu runtime stats
2008-12-18 13:54:01 +01:00
dma-coherent: Restore dma_alloc_from_coherent() large alloc fall back policy.
2009-01-21 18:51:53 +09:00
[CVE-2009-0029] System call wrappers part 04
2009-01-14 14:15:19 +01:00
Merge branch 'linus' into x86/apic
2009-02-13 09:44:22 +01:00
Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-12-30 16:10:19 -08:00
Simplify copy_thread()
2009-04-02 19:04:51 -07:00
freezer_cg: use thaw_process() in unfreeze_cgroup()
2008-10-30 11:38:45 -07:00
futex: remove the pointer math from double_unlock_hb, fix
2009-03-13 10:32:07 +01:00
CRED: Use RCU to access another task's creds and to release a task's own creds
2008-11-14 10:39:19 +11:00
hrtimer: prevent negative expiry value after clock_was_set()
2009-01-30 22:35:34 +01:00
timers: split process wide cpu clocks/timers
2009-02-05 13:04:33 +01:00
Revert "kbuild: strip generated symbols from *.ko"
2009-01-14 21:38:20 +01:00
container freezer: implement freezer cgroup subsystem
2008-10-20 08:52:34 -07:00
rcu: provide RCU options on non-preempt architectures too
2008-12-25 09:31:28 +01:00
kexec: Change kexec jump code ordering
2009-03-30 21:46:55 +02:00
cpumask: remove dangerous CPU_MASK_ALL_PTR, &CPU_MASK_ALL
2009-03-30 22:05:11 +10:30
kprobes: check CONFIG_FREEZER instead of CONFIG_PM
2009-01-16 14:32:17 -05:00
kernel/ksysfs.c:fix dependence on CONFIG_NET
2009-01-06 10:44:31 -08:00
cpumask: remove dangerous CPU_MASK_ALL_PTR, &CPU_MASK_ALL
2009-03-30 22:05:11 +10:30
sched, latencytop: incorporate review feedback from Andrew Morton
2009-02-11 10:18:04 +01:00
lockdep: fix deadlock in lockdep_trace_alloc
2009-03-30 23:19:24 +02:00
lockdep: get_user_chars() redo
2009-02-14 23:28:22 +01:00
lockstat: warn about disabled lock debugging
2009-02-14 23:28:28 +01:00
lockdep: move state bit definitions around
2009-02-14 23:27:59 +01:00
PM: fix build for CONFIG_PM unset
2009-02-21 14:17:17 -08:00
markers/tracpoints: fix non-modular build
2008-11-16 09:52:03 +01:00
Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2
2009-03-27 17:28:43 +01:00
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
mutex: adaptive spinnning, performance tweaks
2009-01-14 19:03:54 +01:00
mutex: implement adaptive spinning
2009-01-14 18:09:02 +01:00
Merge commit 'v2.6.28-rc6' into core/debug
2008-11-26 08:22:50 +01:00
cgroups: relax ns_can_attach checks to allow attaching to grandchild cgroups
2009-04-02 19:04:53 -07:00
User namespaces: set of cleanups (v2)
2008-11-24 18:57:41 -05:00
stackprotector: update make rules
2009-02-10 00:41:54 +01:00
Fix compile warning in kernel/params.c
2008-10-23 12:09:00 -07:00
pid: generalize task_active_pid_ns
2009-01-08 08:31:12 -08:00
posix timers: fix RLIMIT_CPU && fork()
2009-03-23 20:43:35 +01:00
[CVE-2009-0029] System call wrappers part 05
2009-01-14 14:15:20 +01:00
PM: Fix suspend_console and resume_console to use only one semaphore
2009-02-21 14:17:18 -08:00
profiling: fix broken profiling regression
2009-02-10 00:50:37 +01:00
[CVE-2009-0029] System call wrappers part 27
2009-01-14 14:15:29 +01:00
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
"Tree RCU": scalable classic RCU implementation
2008-12-18 21:56:04 +01:00
cpumask: convert rcutorture.c
2009-03-30 22:05:16 +10:30
rcu: Teach RCU that idle task is not quiscent state at boot
2009-02-26 04:08:14 +01:00
"Tree RCU": scalable classic RCU implementation
2008-12-18 21:56:04 +01:00
timers: add mod_timer_pending()
2009-02-18 19:26:33 +01:00
memcg: memory cgroup resource counters for hierarchy
2009-01-08 08:31:05 -08:00
resources: fix parameter name and kernel-doc
2009-01-15 16:39:38 -08:00
epoll keyed wakeups: add __wake_up_locked_key() and __wake_up_sync_key()
2009-04-01 08:59:20 -07:00
sched_clock: cleanups
2009-02-26 21:56:07 +01:00
sched: fix section mismatch
2009-01-06 11:07:15 +01:00
cpumask: remove cpumask_t from core
2009-03-30 22:05:17 +10:30
sched: remove unused fields from struct rq
2009-03-24 23:16:51 +01:00
Merge branch 'sched/urgent'; commit 'v2.6.29-rc5' into sched/core
2009-02-15 21:15:16 +01:00
Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-30 17:17:35 -07:00
sched: add CONFIG_SMP consistency
2008-10-22 10:01:52 +02:00
Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2
2009-03-27 17:28:43 +01:00
sched: remove unused fields from struct rq
2009-03-24 23:16:51 +01:00
x86-64: seccomp: fix 32/64 syscall hole
2009-03-02 15:41:30 -08:00
fix ptrace slowness
2009-03-23 09:22:31 -07:00
generic-ipi: use per cpu data for single cpu ipi calls
2009-01-30 18:31:08 +01:00
Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2
2009-03-27 17:28:43 +01:00
softlock: fix false panic which can occur if softlockup_thresh is reduced
2009-01-14 11:48:07 +01:00
stacktrace: provide save_stack_trace_tsk() weak alias
2008-12-25 11:44:43 +01:00
cpumask: remove cpumask_t from core
2009-03-30 22:05:17 +10:30
sched: don't allow setuid to succeed if the user does not have rt bandwidth
2009-02-27 11:11:53 +01:00
[CVE-2009-0029] Make sys_syslog a conditional system call
2009-01-14 14:15:16 +01:00
mm: fix proc_dointvec_userhz_jiffies "breakage"
2009-04-01 08:59:13 -07:00
net: add ARP notify option for devices
2009-02-01 01:04:33 -08:00
cpumask: convert rest of files in kernel/
2009-01-01 10:12:28 +10:30
kprobes: add tests for register_kprobes
2009-01-06 15:59:20 -08:00
[CVE-2009-0029] System call wrappers part 01
2009-01-14 14:15:18 +01:00
Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-30 17:17:35 -07:00
markers/tracpoints: fix non-modular build
2008-11-16 09:52:03 +01:00
Fix fixpoint divide exception in acct_update_integrals
2009-03-09 08:13:35 -07:00
[CVE-2009-0029] System call wrappers part 19
2009-01-14 14:15:26 +01:00
smp_call_function_single(): be slightly less stupid, fix #2
2009-01-12 16:04:37 +01:00
Merge branch 'master' into next
2009-03-24 10:52:46 +11:00
Fix recursive lock in free_uid()/free_user_ns()
2009-02-27 16:26:21 -08:00
wait: prevent exclusive waiter starvation
2009-02-05 12:56:48 -08:00
cpumask: use new cpumask_ functions in core code.
2009-03-30 22:05:16 +10:30
38460b48d0